Skip the auto shop - Our mechanics make house calls

Q: Surges of power on downhill

asked by on

Sometimes when I drive downhill, my 2009 Toyota Corolla surges forward slightly, making braking more difficult. It seems like this could be a serious problem in the wrong circumstances. What causes this to happen? Is there a technique to braking on downhills that could prevent it? Car has under 100,000 miles on it.

A: The issue you are having sound like either ...

The issue you are having sound like either the throttle is not returning to a closed position or your transmission went into overdrive lock up when you let off of the accelerator pedal. Contact YourMechanic to go through a thorough diagnostic check of your vehicle to determine the causes. This vehicle may be covered by one or more campaigns or recalls for engine acceleration issues. YourMechanic can check for any recalls for you when they comes to check your car for you. YourMechanic will call a Toyota dealer or Toyota directly for you to see if there are any recalls on your vehicle. Have any recalls or Technical Service Bulletins (TSB) done along with any additional diagnostics or repairs recommended by YourMechanic. If after all available recalls are completed, the problem still exist, then YourMechanic can diagnose and repair it for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: car wont start

In this case, the problem is either the range selector which tells the transmission which gear has been selected, or the park/neutral switch, which will cut power to ignition if the selector lever is in any position other than park...

Q: Old car needs $4500 in repairs - is it worth it?

Hi there. Are the repairs worth it? That's a decision that you have to ultimately make for yourself. However, I may be able to assist you with some "food for thought". Have you acquired a second opinion and/or estimate? Always...

Q: How do I use the sunshade?

The sunshade covers the moon roof, to keep excess light and glare from entering your vehicle. When you open the moon roof, the sunshade will automatically open as well. However, at any point you can manually open or close the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.